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PART I <br />Page 2 of 13 <br />C. FOOTNOTES -APPLICABLE TO PRECEDING PAGES <br />a/ The thirty (30) day average shall be determined by the arithmetic mean of all samples rallected doting a thirty <br />(30) consecutive-day period. Samples shall not be used far more than one (1) reporting ~xriod. (Not applicable <br />to fecal coliform determinatiots -see footnote m!.) <br />b/ The seven (7) day average shall be determined by the arithmetic mean of all samples tak~:n iri a seven (7) day <br />period. Samples may not be used for more than one (1) reporting period. (Not applicable to fecal coliform <br />determinations -see footnote m/.) <br />c/ This limitation shall be detertttined by a single sample or set of samples as required by Part [.B., Sample Type. <br />d/ When the measurement frequency indicated is quarterly, the samples shall be collected during March, June, <br />September and December, if a continual discharge occurs. If the discharge is intermittent, then samples shall be <br />collected during the period that discharge occurs. If the permittee, using the approved attalytical methods, <br />monitors any parameter more frequently than required by this permit, then the results of such monitoring shall <br />be included in the calculation and reporting of the values required in the Discharge Monitoring Report Form or <br />other forms as required by the Division. Such increased frequency shall also be indicated. <br />e/ Definitions of Sample Type <br />1. A "composite" sample, far monitoring requirements, is a minimum of four (4) grab samples collected <br />at equally spaced two (2) hour intervals end proportioned according to flow. <br />2. A 'grab" sample, for monitoring requirements, is a single "dip and take' sample:. <br />3. An 'instantaneous" measurement, for monitoring requirements, is a single readit.g, observation, or <br />measurement performed on site. <br />4. A 'continuous" measurement, for flow monitoring requirements, is a measurement obwined from an <br />automatic recording device which continually measures flow. <br />5. A 'visual" observation, for oil and grease monitoring requirements, is observing the discharge to check - <br />for the presence of a visible sheen or floating oil. <br />6. An "in-situ" measurement, for monitoring requirements. is defined as a single reading, observation or <br />measurement taken in the field at the point of discharge. <br />7. A "24 hour composite" sample is a combination of at least eight (g) sample aliyuots of at least 100 <br />milliliters, collected at equally spaced intervals during the operating hours of a facility over a <br />twenty-four (24) hour period. For volatile pollutants, aliquots must be combined in the laboratory <br />immediately before analysis. The composite must be Flow proportional; either the ttme interval <br />between each aliquot or the volume of each aliquot must be proportional to either the wastewater or <br />efFluen[ flow a[ the time of sampling or the total wastewater or effluent Flow since the collection of the <br />previous aliquot. Aliquots may be collected manually or automatically. <br />f/ in the event an oil sheen or floating oil is observed, a grab sample shall be collected, analyzed, and reported on <br />the appropriate DMR. In addition, corrective action shall be taken immediately to mitittale the discharge of oil <br />and grease. A description of the corrective action taken should be included with the DMII. <br />g/ Where, based on a minimum of 5 samples, the pertttittee demonstrates to the satisfaction of the Water Quality <br />Control Division that the level of total dissolved solids (TDS) in the effluent can be calculated based upon the <br />level of elutrical conductivity, the permittee tray measure and report TDS in terra5 of electrical conductivity. <br />